Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61bedbe95428718…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 10:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 435f3033fe56a47f87551a2b5cd935be SHA-1: bcae78c54adea8118de9a9c627c3cca428185cfb SHA-256: b61bedbe95428718be823b028e9729554d9f5ea58101b75585c853c2e31bba52
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using many disposable domains for link farming, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=software+updates+for+samsung+galaxy+s4 PDF link annotation
    • https://bimetoor.com/basefile/bimetoorir/files/83691483942.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/75817016171.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/1829479157.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/69380985417.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/58083541898.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/39377165371.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/91790909006.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/fefixesuvejufikijuk.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/78112137200.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/45969953326.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/dijaluwanu.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/8782552341.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/82507195052.pdfIn PDF document text
    • http://aquatherm-graz.at/files/wuvaxejugejaribokijogos.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/rafovoxerilas.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/redofododozikiluxotamokow.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/35387669627.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/ruludefuzen.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/14794541461.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/26328327306.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/10905779178.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/tadeserejenawixagaxanovim.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/26215022067.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/3152758297.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/66163881527.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 16188 bytes
SHA-256: bc8e60ced95b4e2d9f37b3af7a0be7f0a6f8db2c08c2405702eb8ab43a2a5c70
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 11304 bytes
SHA-256: 27d40f075b48d77e389eaa945cfccbc6fe0d118cf68634c64652fcdf7efd3dd2
font_02_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1